Weighing-scale



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WBIGHING SCALE. l NQ.'369,284. Patented Aug. 30, 1887.

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WEIGHING SCALE. No. 369,234. Patgnted Aug. so, 1887.

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` G. W. CRAIG.

' WBIGHING SCALE. No. 369,234. Patented Aug. 30, 1887.

ATTORNEYS.

UNITED STATES PATENT OTEICE..v

GEORGE CRAIG, OF GRIMMS LANDING, VES'I VIRGINIA.

SPECIFICATION forming part of Letters Patent No. 369,234, dated August 30, 188?.

Serial No. 236,091. (No model.)

To all whom it 71mg/ concern.-

Beit known that I, GEORGE W. CRAIG, a citizen of the United States, residing at Grimms Landing, in the county of Mason and State of Vest Virginia, have invented a new and useful Improvement in VVeighing-Seales, of which the following is a specification.

My invention relates to weighingscales generally, and more particularly to scales for weighing heavy bodies, lsuch as railway ears and locomotives, loaded wagons, live stock, Sto.; and the object of my invention is to provide a frame-work and weighing apparatus of simple and cheap construction and accurate means for adjustment, and which can be built complete at the shop and transported bodily in condition for use.

The invention consists in certain improvements in construction, which'will be hereinafter fully described and claimed.

In the drawings, Figure 1 is a plan view. Fig. 2 is an end elevation. Fig. 3 is a longitudinal section on line .fr x of Fig. l, showing the weighing-beams in side elevation. Fig. i shows a modified construction of the platform levers or beams.

The frame-Work which supports the weighing mechanism is composed of end sills, A A, formed from heavy timber, and two longitudinal beams, B B, mortised into said sills, and all forming a rectangular base. At each corner of the base is an upright, C, the two uprights on each side being connected by a longitudinal beam, D, at the top, and by diagonal beams E, while the longitudinal beams B and D are further braced by an upright, F. Diagonal braces G are also bolted to the upright C and sills A, as shown in Fig. 2. The end and side sills may also be braced at each corner, as shown at H, Fig. l. This construction produces avery strong and rigid framework, which may be built at the shop and transported bodily, together with the weighing mechanism, now to be described.

The weighing-frame is composed of two heavy side beams, I I, and two end pieces, J J. At each end of the side beams, I I, are downwardly-proj ecting extensions @which form the bearing-surfaces. The end beams, J, extend a short distance beyond the side beams, as shown at j. (See Figs. l and 2.) The frame may support a platform,or traclrrails may be laid directly upon the beams I I. The weighingvframe is suspended by a system of yielding tension-rods. (FullyshowninFigl.) Of these rods four extend in a general longitudinal direction relatively to the frame and four directly transverse. Ihe longitudinal rods KK K K connect the end beams of the weighingfraine to the uprights of the main frame on each side, being headed in the upright and secured by a nut in the end beam, whereby the tension may be regulated. rlhe transverse tierods L L L L are situated in pairs near oppo site ends, and are headed in the upper sill of the main frame, two on each side. Each rod L extends through both of the side beams of the weighing-frame, and has a nut at its end for securing it rmly and maintaining the proper tension. rlhe weighing-frame is thus supported firmly, as far as any horizontal movement is concerned, but is permitted to yield when subjected to a load, as in operation. The weighing-frame rests upon bearings M, which are pins, each secured in the slotted platformlevers N and O by means of an enlarged and beveled head, m, andatighteningnut, m', by means vof which all the bearings may be accurately adjusted to the platform. The platform-lever N is pivoted by means of its hooked end n upon a vertical pin, n, in the end sill of the main frame.

Ihe slotted lever itself is composed of two bars, n2 n3, connected at the pivoted end and diverging near the middle to inclose the see ond lever, O. The second lever, O, is of about half the length of the iirst, and is similarly pivoted upon apin, o', placed near the middle of the end sill,and the free ends of both levers are supported by a stirrup, I), suspended from one of the intermediate scale-beams, Q Q.

It will be understood that the construction of theplatformlevers is the same at both ends, and that the description thus far given applies to both.

It will be noticed that while the four slotted levers with-movable pivot-bearings work in pairs andin perfect harmony, yet each lever works independently of the others, and a pressure on any one ofthe pivots is communicated directly to the weighing-beam without any direct eect on its fellow lever on the op- IOO posite pair of levers. The Weight is transmitted to the scale-beam through the intermediate beams, Q Q, before mentioned. Each of these beams is supported at one end upon a knife-edged rest, q, attached to the main frame, and the free end oi' each rests in a stirrup, q', suspended from the scale-beam R,such ends being Wholly disconnected from each other.

The stirrups P are suspended from thc beams Q at the proper distance from the pivot, and the resistance of the beams is regulated by a sliding counter-weight upon each. The scalebeani R is pivoted upon a pin, r, in a bracket, R', on the main frame, and vibrates between the stops 7"'1", lts short arm supports the stir rups q, in which the beams Q Q, rest, and on its surface is marked a scale for pounds and fractions. It supports two slidingr indicating- Weights, S T, as shown, adapted to the respective scales, one to indicate tons and the other pounds and fractions.

.l have shown in Fig. 4la niodilled construction ofthe platform-levers, in which the longer lever, instead of extending to and being supported by the stirrup l?, has its ends formed into extensions t, which rest on pin u, secured to the second lever, which alone is supported by the stirrup. In all other respects the construction is similar to that already described.

Having described my invention, I claim as follows:

l. The combination, with the stationary frame, of two end levers fulcrumcd at the opY posite ends of said frame, bearings on the upper sides of the several levers, two levers i'ulcruined at their outer ends to one side of the frame and supporting the free ends of the end levers, and a scale-beam supporting the inner ends of the said side levers, with the Weighing-frame resting at its ends upon the bearing on the end levers, substantially as set forth.

2. The combination ot' the main frame, the long levers N, and short levers O, fulcrumed on the ends of the frame at a o', respectively, and provided with the upward-extending bearings m, the levers Q', fulcrumed at their outer ends to the frame' at right angles to the levers N O, the stirrups P, depending` from the side levers, Q, and supporting the free ends of the levers N O, the scale-beam lt, and the stirrup q,connected to the inner end ol` said beam and supporting the inner or free ends ol' the side levers, Q, with the Weighing-traine resting upon the four bearings m, substantially as set fort-ln 3. The combination, with the weighing frame or platform of a scale, of a pair of independently-pivoted and slotted levers at each end, each lever being provided with a bearing adj ustablysecured in its slot, substantially as set forth.

4. The combination, with the main 'frame and the scale-supporting levers, oi' the weighing-frame supported by said levers, the hori- Zontal adjustable rods L, connecting the side beams ol the Weighing-frame With the main Atranne, and the oblique adj ustablc rods K,con

necting the ends of the weighing-frame with the opposite ends ofthe main frame, substantially as set forth.

GEORGE XV., CRAG.

Witnesses:

C. B. lVliGGnNnn, A. E. 01mm. 

